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Your g-g-grandmother's name was LEANNA MULLIS, not LEANDER, (a masculine name). She was married to Corneilus "Neil" Lister,1836, s/o William Bright Lister, born abt 1798, SC, and perhaps his second wife, Sarah "Sally" Davis, born abt 1805. William and "Sally" & family are in the 1840 census of Marion Co., SC, about 1848 they moved to Pulaski Co.,GA.
All we have to do is find the Mullis family in that county from which she came.